Answer: Option D
Step-by-step explanation: Catalase is an enzyme like that of all the other enzymes and is influenced by temperature and acid.
Temperature and pH has a significant effect on the structure and function of the enzyme. This enzymes best works at 37 degrees Celsius inside the human body.
Now if the enzyme is exposed to heat and acid then enzyme denaturation will take place as all the enzymes are proteinous in nature and its shape will change.